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Multigeneric resistance to benzimidazole anthelmintics in four sheep flocks

Authors: Pomroy WE, Probert AD, Charleston WAG, West DM
Publication: New Zealand Veterinary Journal, Volume 37, Issue 2, pp 76-78, Jun 1989
Publisher: Taylor and Francis

Animal type: Livestock, Production animal, Ruminant, Sheep
Subject Terms: Alimentary system/gastroenterology, Anthelmintics, Parasite control, Parasites - internal, Animal remedies/veterinary medicines, Nematode, Treatment/therapy
Article class: Clinical Communication

Abstract: Clinical parasitism associated with multigeneric resistance to benzimidazole anthelmintics was investigated in four sheep flocks during February and March 1989. The genera considered resistant were Haemonchus and Nematodirus spp. on all four farms and Trichostrongylus and Ostertagia spp. on three of the four farms. It is suggested that when investigating cases of suspected drench resistance, postdrenching worm counts are useful to help identify the resistant worm species present.

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